document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1172280>Question 1172280</A>: <I><SPAN STYLE=\"word-break: break-all;\"> How many quarts of an 80% alcohol solution must be added to 10 quarts of a 50% alcohol solution to give a 70% solution? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #797283 by </B><A HREF=/tutors/aboutme.mpl?userid=greenestamps><B>greenestamps(13200)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=greenestamps><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=greenestamps><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=797283\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <br><BR>\n" );
document.write( "A solution without formal algebra....<br><BR>\n" );
document.write( "(1) 70% is 2/3 of the way from 50% to 80% (picture the three percentages on a number line....)<br><BR>\n" );
document.write( "(2) That means 2/3 of the mixture is the 80% solution.<br><BR>\n" );
document.write( "So the 10 quarts of the 50% solution is 1/3 of the mixture; and that means the 2/3 of the mixture is 20 quarts.<br><BR>\n" );
document.write( "ANSWER: 20 quarts<br><BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );